You have three different energy levels each going to the ground state in the first problem, as correctly solved by you. The second part asks for three wavelengths: the wavelengths of photons emitted when the third excited state goes to the second and first excited states, and when the second excited state goes to the first excite state.

Either the book missed the last digit or my answer is wrong since 152 nm is shown in the book for wavelength 3. and yeah..my other answers are off about 1 but that's pretty close ,since we are dealing with such small numbers after all... Thanks again.